Infant body temperature is mostly measured by axillary temperature, 37.5 ℃ is not normal. Infant body temperature 37.5 ℃ belongs to low fever, is not normal, need to find the cause of fever in time, give symptomatic treatment. 1. Physiological reasons, the infant thermoregulation center is not well developed, vulnerable to external influences, such as excessive warmth, environmental factors, crying, dehydration and other factors leading to fever, can be dealt with through timely cooling, drinking water and other ways, the body temperature will gradually drop to normal. 2. Pathological factors, such as infections, mostly seen in acute upper respiratory tract infections and other respiratory diseases, the baby is often accompanied by runny nose, cough and other respiratory tract infection symptoms; infectious diseases, such as toddler emergency rash and other diseases. Infant body temperature 37.5 ℃ is not normal, exclude the physiological factors that cause fever, need to consult a doctor in a timely manner to clarify the cause of fever, and give timely treatment to avoid delaying the condition.